Presenting: Dafna Shahaf Infranet: Circumventing Web Censorship and

Presenting: Dafna Shahaf Infranet: Circumventing Web Censorship and

Presenting: Dafna Shahaf Infranet: Circumventing Web Censorship and Surveillance Nick Feamster, Magdalena Balazinska, Greg Harfst, Hari Balakrishnan, David Karger ?

+ IP, key 3. Hide( ) 1. Tunnel

Challenge! 2. Hide( BBC.com ) + IP, key Discussion (1) James Bond movie! Response of U.S. Army?

Human component: software distribution Assumptions Scope of possible attacks from the censor? Censor does not want to affect normal users Downsampling images? Discussion (2)

Detecting responders by analyzing downstream traffic Errors? See if hash changes? Other schemes Random numbers in hyperlinks? Overhead seems significant Requests adequately spaced

Human factors Altruism Fear of punishment Improving Wireless Privacy with an Identifier-Free Link Layer Protocol Ben Greenstein, Damon McCoy, Jeffrey Pang,

Tadayoshi Kohno, Srinivasan Seshan, David Wetherall Problem Packets still carry header information Cleartext Can be used to identify and track users Solution: Slyfy

Use predetermined aliases Encapsulating protocol Discussion Surprise Deployment: Different encryption mechanism Cold start

Large reduction in throughput De-emphasized, deal breaker Wireless Who does the sender trust? Mechanism for distributing symmetric keys

reveals too much? Solved(?)

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